Archipelago » qemu

/*

 * QEMU Crystal CS4231 audio chip emulation

 *

 * Copyright (c) 2006 Fabrice Bellard

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#include "hw.h"

#include "audiodev.h"

#include "audio/audio.h"

#include "isa.h"

#include "qemu-timer.h"

/*

  Missing features:

  ADC

  Loopback

  Timer

  ADPCM

  More...

*/

/* #define DEBUG */

/* #define DEBUG_XLAW */

static struct {

    int irq;

    int dma;

    int port;

    int aci_counter;

} conf = {9, 3, 0x534, 1};

#ifdef DEBUG

#define dolog(...) AUD_log ("cs4231a", __VA_ARGS__)

#else

#define dolog(...)

#endif

#define lwarn(...) AUD_log ("cs4231a", "warning: " __VA_ARGS__)

#define lerr(...) AUD_log ("cs4231a", "error: " __VA_ARGS__)

#define CS_REGS 16

#define CS_DREGS 32

typedef struct CSState {

    QEMUSoundCard card;

    qemu_irq pic;

    uint32_t regs[CS_REGS];

    uint8_t dregs[CS_DREGS];

    int dma;

    int port;

    int shift;

    int dma_running;

    int audio_free;

    int transferred;

    int aci_counter;

    SWVoiceOut *voice;

    int16_t *tab;

} CSState;

#define IO_READ_PROTO(name)                             \

    static uint32_t name (void *opaque, uint32_t addr)

#define IO_WRITE_PROTO(name)                                            \

    static void name (void *opaque, uint32_t addr, uint32_t val)

#define GET_SADDR(addr) (addr & 3)

#define MODE2 (1 << 6)

#define MCE (1 << 6)

#define PMCE (1 << 4)

#define CMCE (1 << 5)

#define TE (1 << 6)

#define PEN (1 << 0)

#define INT (1 << 0)

#define IEN (1 << 1)

#define PPIO (1 << 6)

#define PI (1 << 4)

#define CI (1 << 5)

#define TI (1 << 6)

enum {

    Index_Address,

    Index_Data,

    Status,

    PIO_Data

};

enum {

    Left_ADC_Input_Control,

    Right_ADC_Input_Control,

    Left_AUX1_Input_Control,

    Right_AUX1_Input_Control,

    Left_AUX2_Input_Control,

    Right_AUX2_Input_Control,

    Left_DAC_Output_Control,

    Right_DAC_Output_Control,

    FS_And_Playback_Data_Format,

    Interface_Configuration,

    Pin_Control,

    Error_Status_And_Initialization,

    MODE_And_ID,

    Loopback_Control,

    Playback_Upper_Base_Count,

    Playback_Lower_Base_Count,

    Alternate_Feature_Enable_I,

    Alternate_Feature_Enable_II,

    Left_Line_Input_Control,

    Right_Line_Input_Control,

    Timer_Low_Base,

    Timer_High_Base,

    RESERVED,

    Alternate_Feature_Enable_III,

    Alternate_Feature_Status,

    Version_Chip_ID,

    Mono_Input_And_Output_Control,

    RESERVED_2,

    Capture_Data_Format,

    RESERVED_3,

    Capture_Upper_Base_Count,

    Capture_Lower_Base_Count

};

static int freqs[2][8] = {

    { 8000, 16000, 27420, 32000,    -1,    -1, 48000, 9000 },

    { 5510, 11025, 18900, 22050, 37800, 44100, 33075, 6620 }

};

/* Tables courtesy http://hazelware.luggle.com/tutorials/mulawcompression.html */

static int16_t MuLawDecompressTable[256] =

{

     -32124,-31100,-30076,-29052,-28028,-27004,-25980,-24956,

     -23932,-22908,-21884,-20860,-19836,-18812,-17788,-16764,

     -15996,-15484,-14972,-14460,-13948,-13436,-12924,-12412,

     -11900,-11388,-10876,-10364, -9852, -9340, -8828, -8316,

      -7932, -7676, -7420, -7164, -6908, -6652, -6396, -6140,

      -5884, -5628, -5372, -5116, -4860, -4604, -4348, -4092,

      -3900, -3772, -3644, -3516, -3388, -3260, -3132, -3004,

      -2876, -2748, -2620, -2492, -2364, -2236, -2108, -1980,

      -1884, -1820, -1756, -1692, -1628, -1564, -1500, -1436,

      -1372, -1308, -1244, -1180, -1116, -1052,  -988,  -924,

       -876,  -844,  -812,  -780,  -748,  -716,  -684,  -652,

       -620,  -588,  -556,  -524,  -492,  -460,  -428,  -396,

       -372,  -356,  -340,  -324,  -308,  -292,  -276,  -260,

       -244,  -228,  -212,  -196,  -180,  -164,  -148,  -132,

       -120,  -112,  -104,   -96,   -88,   -80,   -72,   -64,

        -56,   -48,   -40,   -32,   -24,   -16,    -8,     0,

      32124, 31100, 30076, 29052, 28028, 27004, 25980, 24956,

      23932, 22908, 21884, 20860, 19836, 18812, 17788, 16764,

      15996, 15484, 14972, 14460, 13948, 13436, 12924, 12412,

      11900, 11388, 10876, 10364,  9852,  9340,  8828,  8316,

       7932,  7676,  7420,  7164,  6908,  6652,  6396,  6140,

       5884,  5628,  5372,  5116,  4860,  4604,  4348,  4092,

       3900,  3772,  3644,  3516,  3388,  3260,  3132,  3004,

       2876,  2748,  2620,  2492,  2364,  2236,  2108,  1980,

       1884,  1820,  1756,  1692,  1628,  1564,  1500,  1436,

       1372,  1308,  1244,  1180,  1116,  1052,   988,   924,

        876,   844,   812,   780,   748,   716,   684,   652,

        620,   588,   556,   524,   492,   460,   428,   396,

        372,   356,   340,   324,   308,   292,   276,   260,

        244,   228,   212,   196,   180,   164,   148,   132,

        120,   112,   104,    96,    88,    80,    72,    64,

         56,    48,    40,    32,    24,    16,     8,     0

};

static int16_t ALawDecompressTable[256] =

{

     -5504, -5248, -6016, -5760, -4480, -4224, -4992, -4736,

     -7552, -7296, -8064, -7808, -6528, -6272, -7040, -6784,

     -2752, -2624, -3008, -2880, -2240, -2112, -2496, -2368,

     -3776, -3648, -4032, -3904, -3264, -3136, -3520, -3392,

     -22016,-20992,-24064,-23040,-17920,-16896,-19968,-18944,

     -30208,-29184,-32256,-31232,-26112,-25088,-28160,-27136,

     -11008,-10496,-12032,-11520,-8960, -8448, -9984, -9472,

     -15104,-14592,-16128,-15616,-13056,-12544,-14080,-13568,

     -344,  -328,  -376,  -360,  -280,  -264,  -312,  -296,

     -472,  -456,  -504,  -488,  -408,  -392,  -440,  -424,

     -88,   -72,   -120,  -104,  -24,   -8,    -56,   -40,

     -216,  -200,  -248,  -232,  -152,  -136,  -184,  -168,

     -1376, -1312, -1504, -1440, -1120, -1056, -1248, -1184,

     -1888, -1824, -2016, -1952, -1632, -1568, -1760, -1696,

     -688,  -656,  -752,  -720,  -560,  -528,  -624,  -592,

     -944,  -912,  -1008, -976,  -816,  -784,  -880,  -848,

      5504,  5248,  6016,  5760,  4480,  4224,  4992,  4736,

      7552,  7296,  8064,  7808,  6528,  6272,  7040,  6784,

      2752,  2624,  3008,  2880,  2240,  2112,  2496,  2368,

      3776,  3648,  4032,  3904,  3264,  3136,  3520,  3392,

      22016, 20992, 24064, 23040, 17920, 16896, 19968, 18944,

      30208, 29184, 32256, 31232, 26112, 25088, 28160, 27136,

      11008, 10496, 12032, 11520, 8960,  8448,  9984,  9472,

      15104, 14592, 16128, 15616, 13056, 12544, 14080, 13568,

      344,   328,   376,   360,   280,   264,   312,   296,

      472,   456,   504,   488,   408,   392,   440,   424,

      88,    72,   120,   104,    24,     8,    56,    40,

      216,   200,   248,   232,   152,   136,   184,   168,

      1376,  1312,  1504,  1440,  1120,  1056,  1248,  1184,

      1888,  1824,  2016,  1952,  1632,  1568,  1760,  1696,

      688,   656,   752,   720,   560,   528,   624,   592,

      944,   912,  1008,   976,   816,   784,   880,   848

};

static void cs_reset (void *opaque)

{

    CSState *s = opaque;

    s->regs[Index_Address] = 0x40;

    s->regs[Index_Data]    = 0x00;

    s->regs[Status]        = 0x00;

    s->regs[PIO_Data]      = 0x00;

    s->dregs[Left_ADC_Input_Control]          = 0x00;

    s->dregs[Right_ADC_Input_Control]         = 0x00;

    s->dregs[Left_AUX1_Input_Control]         = 0x88;

    s->dregs[Right_AUX1_Input_Control]        = 0x88;

    s->dregs[Left_AUX2_Input_Control]         = 0x88;

    s->dregs[Right_AUX2_Input_Control]        = 0x88;

    s->dregs[Left_DAC_Output_Control]         = 0x80;

    s->dregs[Right_DAC_Output_Control]        = 0x80;

    s->dregs[FS_And_Playback_Data_Format]     = 0x00;

    s->dregs[Interface_Configuration]         = 0x08;

    s->dregs[Pin_Control]                     = 0x00;

    s->dregs[Error_Status_And_Initialization] = 0x00;

    s->dregs[MODE_And_ID]                     = 0x8a;

    s->dregs[Loopback_Control]                = 0x00;

    s->dregs[Playback_Upper_Base_Count]       = 0x00;

    s->dregs[Playback_Lower_Base_Count]       = 0x00;

    s->dregs[Alternate_Feature_Enable_I]      = 0x00;

    s->dregs[Alternate_Feature_Enable_II]     = 0x00;

    s->dregs[Left_Line_Input_Control]         = 0x88;

    s->dregs[Right_Line_Input_Control]        = 0x88;

    s->dregs[Timer_Low_Base]                  = 0x00;

    s->dregs[Timer_High_Base]                 = 0x00;

    s->dregs[RESERVED]                        = 0x00;

    s->dregs[Alternate_Feature_Enable_III]    = 0x00;

    s->dregs[Alternate_Feature_Status]        = 0x00;

    s->dregs[Version_Chip_ID]                 = 0xa0;

    s->dregs[Mono_Input_And_Output_Control]   = 0xa0;

    s->dregs[RESERVED_2]                      = 0x00;

    s->dregs[Capture_Data_Format]             = 0x00;

    s->dregs[RESERVED_3]                      = 0x00;

    s->dregs[Capture_Upper_Base_Count]        = 0x00;

    s->dregs[Capture_Lower_Base_Count]        = 0x00;

}

static void cs_audio_callback (void *opaque, int free)

{

    CSState *s = opaque;

    s->audio_free = free;

}

static void cs_reset_voices (CSState *s, uint32_t val)

{

    int xtal;

    struct audsettings as;

#ifdef DEBUG_XLAW

    if (val == 0 || val == 32)

        val = (1 << 4) | (1 << 5);

#endif

    xtal = val & 1;

    as.freq = freqs[xtal][(val >> 1) & 7];

    if (as.freq == -1) {

        lerr ("unsupported frequency (val=%#x)\n", val);

        goto error;

    }

    as.nchannels = (val & (1 << 4)) ? 2 : 1;

    as.endianness = 0;

    s->tab = NULL;

    switch ((val >> 5) & ((s->dregs[MODE_And_ID] & MODE2) ? 7 : 3)) {

    case 0:

        as.fmt = AUD_FMT_U8;

        s->shift = as.nchannels == 2;

        break;

    case 1:

        s->tab = MuLawDecompressTable;

        goto x_law;

    case 3:

        s->tab = ALawDecompressTable;

    x_law:

        as.fmt = AUD_FMT_S16;

        as.endianness = AUDIO_HOST_ENDIANNESS;

        s->shift = as.nchannels == 2;

        break;

    case 6:

        as.endianness = 1;

    case 2:

        as.fmt = AUD_FMT_S16;

        s->shift = as.nchannels;

        break;

    case 7:

    case 4:

        lerr ("attempt to use reserved format value (%#x)\n", val);

        goto error;

    case 5:

        lerr ("ADPCM 4 bit IMA compatible format is not supported\n");

        goto error;

    }

    s->voice = AUD_open_out (

        &s->card,

        s->voice,

        "cs4231a",

        s,

        cs_audio_callback,

        &as

        );

    if (s->dregs[Interface_Configuration] & PEN) {

        if (!s->dma_running) {

            DMA_hold_DREQ (s->dma);

            AUD_set_active_out (s->voice, 1);

            s->transferred = 0;

        }

        s->dma_running = 1;

    }

    else {

        if (s->dma_running) {

            DMA_release_DREQ (s->dma);

            AUD_set_active_out (s->voice, 0);

        }

        s->dma_running = 0;

    }

    return;

 error:

    if (s->dma_running) {

        DMA_release_DREQ (s->dma);

        AUD_set_active_out (s->voice, 0);

    }

}

IO_READ_PROTO (cs_read)

{

    CSState *s = opaque;

    uint32_t saddr, iaddr, ret;

    saddr = GET_SADDR (addr);

    iaddr = ~0U;

    switch (saddr) {

    case Index_Address:

        ret = s->regs[saddr] & ~0x80;

        break;

    case Index_Data:

        if (!(s->dregs[MODE_And_ID] & MODE2))

            iaddr = s->regs[Index_Address] & 0x0f;

        else

            iaddr = s->regs[Index_Address] & 0x1f;

        ret = s->dregs[iaddr];

        if (iaddr == Error_Status_And_Initialization) {

            /* keep SEAL happy */

            if (s->aci_counter) {

                ret |= 1 << 5;

                s->aci_counter -= 1;

            }

        }

        break;

    default:

        ret = s->regs[saddr];

        break;

    }

    dolog ("read %d:%d -> %d\n", saddr, iaddr, ret);

    return ret;

}

IO_WRITE_PROTO (cs_write)

{

    CSState *s = opaque;

    uint32_t saddr, iaddr;

    saddr = GET_SADDR (addr);

    switch (saddr) {

    case Index_Address:

        if (!(s->regs[Index_Address] & MCE) && (val & MCE)

            && (s->dregs[Interface_Configuration] & (3 << 3)))

            s->aci_counter = conf.aci_counter;

        s->regs[Index_Address] = val & ~(1 << 7);

        break;

    case Index_Data:

        if (!(s->dregs[MODE_And_ID] & MODE2))

            iaddr = s->regs[Index_Address] & 0x0f;

        else

            iaddr = s->regs[Index_Address] & 0x1f;

        switch (iaddr) {

        case RESERVED:

        case RESERVED_2:

        case RESERVED_3:

            lwarn ("attempt to write %#x to reserved indirect register %d\n",

                   val, iaddr);

            break;

        case FS_And_Playback_Data_Format:

            if (s->regs[Index_Address] & MCE) {

                cs_reset_voices (s, val);

            }

            else {

                if (s->dregs[Alternate_Feature_Status] & PMCE) {

                    val = (val & ~0x0f) | (s->dregs[iaddr] & 0x0f);

                    cs_reset_voices (s, val);

                }

                else {

                    lwarn ("[P]MCE(%#x, %#x) is not set, val=%#x\n",

                           s->regs[Index_Address],

                           s->dregs[Alternate_Feature_Status],

                           val);

                    break;

                }

            }

            s->dregs[iaddr] = val;

            break;

        case Interface_Configuration:

            val &= ~(1 << 5);   /* D5 is reserved */

            s->dregs[iaddr] = val;

            if (val & PPIO) {

                lwarn ("PIO is not supported (%#x)\n", val);

                break;

            }

            if (val & PEN) {

                if (!s->dma_running) {

                    cs_reset_voices (s, s->dregs[FS_And_Playback_Data_Format]);

                }

            }

            else {

                if (s->dma_running) {

                    DMA_release_DREQ (s->dma);

                    AUD_set_active_out (s->voice, 0);

                    s->dma_running = 0;

                }

            }

            break;

        case Error_Status_And_Initialization:

            lwarn ("attempt to write to read only register %d\n", iaddr);

            break;

        case MODE_And_ID:

            dolog ("val=%#x\n", val);

            if (val & MODE2)

                s->dregs[iaddr] |= MODE2;

            else

                s->dregs[iaddr] &= ~MODE2;

            break;

        case Alternate_Feature_Enable_I:

            if (val & TE)

                lerr ("timer is not yet supported\n");

            s->dregs[iaddr] = val;

            break;

        case Alternate_Feature_Status:

            if ((s->dregs[iaddr] & PI) && !(val & PI)) {

                /* XXX: TI CI */

                qemu_irq_lower (s->pic);

                s->regs[Status] &= ~INT;

            }

            s->dregs[iaddr] = val;

            break;

        case Version_Chip_ID:

            lwarn ("write to Version_Chip_ID register %#x\n", val);

            s->dregs[iaddr] = val;

            break;

        default:

            s->dregs[iaddr] = val;

            break;

        }

        dolog ("written value %#x to indirect register %d\n", val, iaddr);

        break;

    case Status:

        if (s->regs[Status] & INT) {

            qemu_irq_lower (s->pic);

        }

        s->regs[Status] &= ~INT;

        s->dregs[Alternate_Feature_Status] &= ~(PI | CI | TI);

        break;

    case PIO_Data:

        lwarn ("attempt to write value %#x to PIO register\n", val);

        break;

    }

}

static int cs_write_audio (CSState *s, int nchan, int dma_pos,

                           int dma_len, int len)

{

    int temp, net;

    uint8_t tmpbuf[4096];

    temp = len;

    net = 0;

    while (temp) {

        int left = dma_len - dma_pos;

        int copied;

        size_t to_copy;

        to_copy = audio_MIN (temp, left);

        if (to_copy > sizeof (tmpbuf)) {

            to_copy = sizeof (tmpbuf);

        }

        copied = DMA_read_memory (nchan, tmpbuf, dma_pos, to_copy);

        if (s->tab) {

            int i;

            int16_t linbuf[4096];

            for (i = 0; i < copied; ++i)

                linbuf[i] = s->tab[tmpbuf[i]];

            copied = AUD_write (s->voice, linbuf, copied << 1);

            copied >>= 1;

        }

        else {

            copied = AUD_write (s->voice, tmpbuf, copied);

        }

        temp -= copied;

        dma_pos = (dma_pos + copied) % dma_len;

        net += copied;

        if (!copied) {

            break;

        }

    }

    return net;

}

static int cs_dma_read (void *opaque, int nchan, int dma_pos, int dma_len)

{

    CSState *s = opaque;

    int copy, written;

    int till = -1;

    copy = s->voice ? (s->audio_free >> (s->tab != NULL)) : dma_len;

    if (s->dregs[Pin_Control] & IEN) {

        till = (s->dregs[Playback_Lower_Base_Count]

            | (s->dregs[Playback_Upper_Base_Count] << 8)) << s->shift;

        till -= s->transferred;

        copy = audio_MIN (till, copy);

    }

    if ((copy <= 0) || (dma_len <= 0)) {

        return dma_pos;

    }

    written = cs_write_audio (s, nchan, dma_pos, dma_len, copy);

    dma_pos = (dma_pos + written) % dma_len;

    s->audio_free -= (written << (s->tab != NULL));

    if (written == till) {

        s->regs[Status] |= INT;

        s->dregs[Alternate_Feature_Status] |= PI;

        s->transferred = 0;

        qemu_irq_raise (s->pic);

    }

    else {

        s->transferred += written;

    }

    return dma_pos;

}

static void cs_save (QEMUFile *f, void *opaque)

{

    CSState *s = opaque;

    unsigned int i;

    uint32_t val;

    for (i = 0; i < CS_REGS; i++)

        qemu_put_be32s (f, &s->regs[i]);

    qemu_put_buffer (f, s->dregs, CS_DREGS);

    val = s->dma_running; qemu_put_be32s (f, &val);

    val = s->audio_free;  qemu_put_be32s (f, &val);

    val = s->transferred; qemu_put_be32s (f, &val);

    val = s->aci_counter; qemu_put_be32s (f, &val);

}

static int cs_load (QEMUFile *f, void *opaque, int version_id)

{

    CSState *s = opaque;

    unsigned int i;

    uint32_t val, dma_running;

    if (version_id > 1)

        return -EINVAL;

    for (i = 0; i < CS_REGS; i++)

        qemu_get_be32s (f, &s->regs[i]);

    qemu_get_buffer (f, s->dregs, CS_DREGS);

    qemu_get_be32s (f, &dma_running);

    qemu_get_be32s (f, &val); s->audio_free  = val;

    qemu_get_be32s (f, &val); s->transferred = val;

    qemu_get_be32s (f, &val); s->aci_counter = val;

    if (dma_running && (s->dregs[Interface_Configuration] & PEN))

        cs_reset_voices (s, s->dregs[FS_And_Playback_Data_Format]);

    return 0;

}

int cs4231a_init (qemu_irq *pic)

{

    int i;

    CSState *s;

    s = qemu_mallocz (sizeof (*s));

    s->pic = isa_reserve_irq(conf.irq);

    s->dma = conf.dma;

    s->port = conf.port;

    for (i = 0; i < 4; i++) {

        register_ioport_write (s->port + i, 1, 1, cs_write, s);

        register_ioport_read (s->port + i, 1, 1, cs_read, s);

    }

    DMA_register_channel (s->dma, cs_dma_read, s);

    register_savevm ("cs4231a", 0, 1, cs_save, cs_load, s);

    qemu_register_reset (cs_reset, s);

    cs_reset (s);

    AUD_register_card ("cs4231a", &s->card);

    return 0;

}